Brittney Patera, M.S., registered dietitian and sports dietitian nutritionist, relates sugars to the phenomenon that often comes soon after drinking an energy drink: the crash.

“You have readily available sugars mixed with caffeine,” Patera said. “After it is cleared from your bloodstream and your cells are finished attacking the sugars, you crash.”

According to a study by The National Council on Alcoholism and Drug Dependence, the number of emergency room visits due to heart trauma and adrenaline rush from energy drink consumption nearly doubled from 2007-2011. Many of these cases involved people aged 18-25.